Screen for grain-separators.



PATENTED JUNE 23, 1908.

H'. J. BOLTS. SCREEN FOR GRAINSEPARATORS;

APPLICATION FILED MAR l9.'-l906.

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UNITED STATES PATENT OFFICE. 4

HARRY .T. FOLTS, OF ST. CLOUD, MINNESOTA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO MAPLE- BAY MANUFACTURING COMPANY, OF OROOKSTON, MINNESOTA, A CORPORATION.

SCREEN FOR GRAIN-SEPARATORS.

Specification of Letters Patent.

Application filed March 19, 1906. Serial No. 306,834.

To all whom it may concern:

Be it known that I, HARRY J. FoLrs, a citizen of the United States, residing at St. Cloud, in the county of Stearns and State of Minnesota, have invented new and useful Improvements in Screens for Grain-Separators, of which the following is a specification. a

This invention is a screen structure designed for use in grain separators of the shaking screen type in Which the screens are carried by a reciprocating shoe for the purpose of effecting the separation of the grain.

The object of this invention is to provide improved means for supporting a series or plurality of screens in proper position with respect to each other, and for carrying the grain from one screen to another.

A further object of the invention is to connect a set of screens rigidly together to form a single structure, capable of being cheaply constructed as compared to the cost of separate screens, and also capable of being quickly and easily placed in or removed from the shoe.

A further object of the invention is to provide a screen having an improved separating action, particularly for the separation of Wheat and oats, for Which grains the device is particularly intended and adapted.

In the accompanying drawings, Figure 1 is a top plan view of the invention. Fig. 2 is a section thereof on the line 22 of Fig. 1. Fig. 3 is a side elevation of the structure.

The screen or so arator as a whole is composed of a plura ity of individual screens connected and supported as a unitary structure and as such capable of being set in or removed from the shoe as desired. The structure is built up of frames securely attached together at the sides and head, each frame consisting of side pieces 6 of wood and head and tail cross pieces 7 and 8, respectively, with s 'acing pieces 6" between the side bars 6. Eac frame carries a screen of perforated metal indicated at 9 Which is secured at the head to the cross piece 7 and at the tail has an unperforated piece of metal 10 covering the cross piece 8. Instead of the unperforated piece of metal, the screen may have anjunperforated portion or extension at the tail thereof to cover the tail piece 8. The series of frames and the screens carried thereby are stepped down below each other as clearly shown in the sectional view. The

are secured at their side edges or ends in the side frames 6. These sheet iron plates serve to carry the grain from one screen to the next and they also serve to bind the parts together and form a strong and rigid structure. The sheet metal plates 13 cover the head bars 7 and extend to or join with the upper edges of the perforated plates 9, and in connection with the plates 10, which cover the tail bars, form a continuous metallic flow surface from one end to the other of the structure, which serves to cause a rapid flow and prevents clogging and also prevents wear of the wooden bars. Oil cloth aprons are used to assist in the separation. One shown at 14 is tacked to the cross piece 11 and lies upon the upper screen. For the second and third screens these a rons may be omitted, but they are prefera ly applied to the fourth and fifth screens, as indicated at 15, by tacking the same to the inner edge of the tail pieces 8 of the screen above, so thatthe cloth will cover the screen below. The purpose of the cloth is to hold oats flatwise, so that they cannot drop through the perforations, and also to insure a smooth and even feed over the metal.

In use, the screen is set and fastened in the shoe in any suitable manner. Inasmuch as this screen is a rigid unitary structure it may be held in the shoe by simply clamping the same between the sides thereof by a tie bolt connecting said sides and provided with a thumb screw to draw the same against the sides of the screen. When the grain is fed to the screen the wheat will dro through the. perforations and the oats w' tail off the ends, the sheet iron flow plates 13 serving to conduct the stock from one screen to the next until perfect separation is effected.

I claim:

A screen structure for rain separators, comprising a succession of spaced screens, consisting of screen frames having head and tail bars, and side frames, perforated metal 10 coverin the tail bars, whereby a continuglates upon the frames, imperforate metal ous metal OW surface is provided.

ow plates leading from one screen to the In testimony whereof I have signed my next, the upper and lower edges of the plates name to this specification in the presence of 5 being fastened to the hegd tbars (pf tllie sue; two subscribing Witnesses.

cessive screen frames an t e 'si 'e e es 0 the plates being secured in the side flames, HARRY FOLTS' and the lower ends of the plates coverin'g the Witnesses: head bars and extendin to junction with the M. R. KUNsMAN, 10 perforated plates, am? imperforate plates GEO. E. TEW. 

